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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7f15d26c57be5b7516ee62157909865959e6fac74854d5048c97716ae2eee1' 
  AND token = 'Sj/RKWxrUdFV4kyqEO01Oa/4SnPHsGr8UUnHyhm9eVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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