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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bde2fe173d26fac62235009d182206a56cb7bc75445e772cc3236b57fbfba93' 
  AND token = 'cDjyHOtRtfhEjC2pEZAOYjWJfasbxyoniyynewSIgK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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