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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0551157990e48ce772ede44ce0151be94c9b7eff79d619c67b6b161cd9b4612' 
  AND token = 'W/YJK9csveE3S1wcgscqxX68M7bQ81YdyFKBcdoi0gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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