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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9861ab42f31cdf32d99540a6e609606959d2a4abb99a6d81fb89c317a694dac7' 
  AND token = 'UVB6PzKoqrnUW/v0dhqN4aao1BgcYP9hhHwCOpSaiOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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