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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a5cd915b2562c616655fd3937fe43a198551a77cbe0aeafc330b730d8fbd47' 
  AND token = 'PBjBUPC5spcO5i7nOAoFFNoFdaO3+dLV+TFPS+/sS4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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