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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac75ad4adbdd90df59a0ef37d932870c1a5d805fab43dd53b139887739a8aca' 
  AND token = 'MpW6D/IUjwGJQVHmOqLai1Uk7npnG50XV8x1bBhp6LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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