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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e705cff4a2dd5fac11ceccf3e1c13ea513e945053cbc2b76bfae21118caba0' 
  AND token = 'fUfo8z7wVYb8CgXvGrIHbJzXAE6xIBGxTs7otOU9xaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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