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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fee83a2aa5c8590537a1aa1d9bfc6194ea99f4162006d64729c0e8a7491a585' 
  AND token = 'FBuSxMh5yKOuhvLRI7LlUqn+gNocE+aMFN+NCZdtQ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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