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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bada6abf6bc0663444c72455e2ff3cbc589f6526f3b8dfb041b32d21d1a2fd' 
  AND token = 'd5Wy5BEmnov9pgpwaXDge9dva8NDmfQDMy7nnu1w9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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