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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bf94a585c117916c2ae02c7474f9841b5d574ca7d6f380389e0ef518e51128' 
  AND token = 'Ryou3gThvCY8yMGxsbaadDMqrl6iTe8DPNqBRud1pqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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