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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b302c6b1e3eaea1c6601bc683c06ca0a9b6950f6ff96fb9c715be0bf3f199c12' 
  AND token = 'KmctVX3eIs+EI7eMXJdn94QebqL0rDCJRE1+B2jAKjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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