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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c6fb4ac6e3100d66962a0df48887644cd8f0f5e15e6540f7db372ff23b3bbe' 
  AND token = '+LASpACZcyThlOHRZIMfp+Du2Olzh92kBLkniX+H09s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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