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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2867b60a2d3c9854da2f6880af02cfffc6d480d004d0dca0799468aa1f1a507d' 
  AND token = 'IdzWFK8oUpGqqb7LlmwK9fLgP9N0ap4GbUPfDW77wsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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