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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93126644c9b822e1a8b397a5a277215a2baf5c25e18ba6543bc7d4a71356f7' 
  AND token = 'lvuNCpNerP4eB+jEEfcCgLlOF9BjR92ntxSjWVHPS2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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