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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e107f2e0abbfdef316732b02de9f7edad6daa4923306a7ec81dee1bba7ddddde' 
  AND token = 'aULtQ7z2XVUzSNaIdDXPGsAP0CaNY7zVR1/RinoCr9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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