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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c0051962406fe14e90ec32136352da1eb5d36eee51bfdef8589644d9f5ffb5' 
  AND token = 'OUBFvrS5173M2kBcElNtQKzsUMANW/CUgdR/Fokf0s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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