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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e844986ef688e1efd33045d3390f41adf19fcf76783808ecb22aa88e77e4e193' 
  AND token = 'hiJB1do5NXHdERW4RO/Sutm8JpssoscuHHqDcuj5KWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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