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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325b785708a8550a0873b744c1a96cc96610aa4dc1b4bed2d61ab88acfb389ff' 
  AND token = '4RZJ5OZFILPKr5p4yX8Dc3pnhQrvflnVDOmv7sWoI3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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