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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ea931be07b5c89ea02521601f3f6a7f861c0794941609603ee49eecd065e6b' 
  AND token = 'm7pyLf+TDCY0v2gcvVShY+ZoxAwY5Vf2LqiEKxLUG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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