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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75014bb334437634d160556fce0b615277c240dab24908fc3e7a96136d902028' 
  AND token = 'W9Ij4dNk+4kZWh/fZk092e9R+hcRI6yESk/KLNCe878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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