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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95de7bc1374ca9786ef52fea40a952a9216e1fa41cd7d2425cc7abde2fd31bd8' 
  AND token = 'SPIg7TCz5BTVMfnIwF5kLn8vbA6JnDqvHHkhvuSp91E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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