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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bff42e533f1fbc5c9167e18b1dfe4b94720ec4de766adeabc4c91813e8ff55a' 
  AND token = 'wM61O+EP+dy5FNZZzwoklPtAcWCFanK81s5JRL5VpYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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