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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dbfa64cebbd6337fdf65b595a90cf8e6e4032573e9914ed42435a580c798f8' 
  AND token = '7qk6jYs3p2pjfvREo0psk4CUcEY7/a8LDxF7ZtVnMOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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