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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d108f2370c05682e28ffd39f7d287850a7c15e9ea7e93fee3bcaa74a46e87fd' 
  AND token = '9zvNGvzQi8pIT9zra3yYT/H2B2Tkk68KR45dbZb3yqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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