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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4512ef63ee6c684891775366d4e62c53fb74790f9b330205eb90989d1fa5d172' 
  AND token = 'A25/KzuuG8BV1sz/Tr7r0NmTEzwnrjACTtgg9PC1rZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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