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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4469bb222b3ba1f9021ddbbdcaee19803e57cfcef27650e6ac08b3a1c69dfa23' 
  AND token = 'kK/E7rUX14OV5KC3p+E7+TYT6JArSzKNjoBjbMqYOU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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