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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171f8d3c94a775750949e7b0487e482bc5d1a14de2f9f18f8e9ba445db83a6bb' 
  AND token = 'FtAElOSLZHaKGibna9mNVMQGL10HXNhD+f7bdLDbQvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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