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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2501b09c5faf95f380e7c23badf902ad52770b10b25d4eba2485fee307bd6641' 
  AND token = 'pmA+v+MJFK/9JCNfiRg1OTXb0KLDuaxVRvgupcB6QL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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