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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b896e2e82f6054c609c93dcf30a5c24fa83b6f56c6dadfdfdaad301a25d0a0c' 
  AND token = 'azbE/SV4M5uChUuW9lmdsDWlVfGkOBonSzrnnmXOfOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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