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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5454ed29d3058d25e9cd647e70ce6caad86a47b2b5ea8a0d1ba5b53ed080e3' 
  AND token = 'mVTgTNmS2Z77AgnrRvijzAC/d7QrdLMupVNLNJjFm0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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