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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095497342468485a248241fdccf089442b18243c6f1a7d7269bb1d1d2d56772b' 
  AND token = '3M41O6TbgJRLqZFOKyf3YrSVmm011OwNcvQ4K2KM/Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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