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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ab9b6cb471c694fd12c3d33d1814dd2c4d0be15b10cea22c65cae5d45beca9' 
  AND token = 'CUyk46mBHozZyYJSSay1Xd2Xmhm+Uu2ntrsUpez9imM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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