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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92302e8a1cbbfff0ac7ed09a69bedea4d6357e61b0fed7f77912cb29e6fdb30' 
  AND token = 'LmOKIdofCL7gqXKLWKMpORpKVgdzbfeuF4KcZZM1y+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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