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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5848cd79906c04470bb27d7d0be0c1eddbb2c11a28318326d138c26db45c34fb' 
  AND token = '414Mswe9zVsuxXkk6mKPHRpaM2cctHimeI6ioCfrx3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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