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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f5a6c2d3669cf05cd63ef8722f111f2912148f3cdb5552aa3a12ba82638c10' 
  AND token = 'QtU7q38FPvlG7dHfKm03dFngOO0+DzqWRVho12JuOEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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