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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc25499e98c913ea5c4cd063ca96502ec08b028606dfeb69b110a99c6548044' 
  AND token = 'wTyUJGdqI1kfn2ZYfPEnZhno/9fqgy3pB3Cf6zodMt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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