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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb2b6db4c7afd381add66aa81670e943c263b60ac6de107b9baa2e2276477e5' 
  AND token = 'RN9w++L2H0kcGAtphc3YKKojyqROBJBX9j56syHOTtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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