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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc420906fffe8a88914fcf4f49169568b2b4ea541fb00a4073224d286f0b0565' 
  AND token = 'yAixHZWEJZckSuYG+1xpvwbC99ZDB7nXshkoT9SSV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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