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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a536f352953327de452a0c9484de6e7680950326d6671a3d4c2addab4d8e6b9' 
  AND token = '+1E6hACcMbiNpqvCJJNNWB1TzzH7ObWx3+pEySauJWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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