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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc52e442cf965e5f9c2246453af0df4f447268a846e62824b873f266a1c77aa4' 
  AND token = '5h8C9/LI+u9RNiSczzmgagnI0Xo9SVu39RDXmd9owSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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