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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f83d5480a8a889b27b9b30c3586ec282652e176cc5828a365345b9d9641fa4' 
  AND token = '+Q6oq8tRDYW4u2EnAJuly4d+y6BmoobAAYiIfsamsNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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