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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c06904e7991b890e67b64998ac48bb1e8dc0234a2d16f4a52bb566f0daad58' 
  AND token = 'cw3pvmA3T/EuVAOx9US3mdb3/X9wBmQWHIT9CaYdgRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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