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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7706182a76b7ffb2c9f12053169cdef5a657a5ad5237a86c321eb662dbd2930' 
  AND token = '3Dn86XN4Ip6ppDEl0hGlj86z2fGB7EJ8ui8DxgSS+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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