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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dc78bdc9c2982ce9c702545d03d3d864a35a0f008b453e87ecf606c38a42b1' 
  AND token = 'h88tNhIRAtEOthusMOTT4Hy03rSl3aYMe8bPW6Udr1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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