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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0d4aa12edc91e137693ae51d1be5e80f68133d86fe2259a8cbe630ac86e242' 
  AND token = 'rlvhK96o8N2zYQ2hkCmX3Lxob/05hgjfZUp/cMfl8/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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