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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db2d0d62d1c4bd51a33b0db00c5579db370e062715e3d8b5578b86d04ce39f7' 
  AND token = 'O0apiVasLeW+L7vRHyjZ3VpDexv6Mr57LU447193N84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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