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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9958ee35fd212f1b653cbd28a86da89442367bc4f03b585ace075064fac805f0' 
  AND token = 'IKQ6irMRRjWt3bggJOerebOn4fChWHLCkY3e1SDQ4lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}