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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf8048ec418ca6e9abe7d45e910be83dd4a0fdb7678e50232477af6f58755be' 
  AND token = 'TXigIfK7sMWbGc+RvKO1oLSMfHBuDwtHO4at9Vcuc6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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