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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86611752a8dc7da8c60f6e1235f767e920d5b5ca3ef2c6531373561dbccbf6bf' 
  AND token = 'hI3r03lof9J/cJ51hxgYqkN1S1rTn6HIqnHkznluEsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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