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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de928daf58423682956f23525cb863a7eb55a1e5b62d0a452e2a30f763a82ef' 
  AND token = 'N8e/s0TLc7mOAPLtAmTQIPikCqf8BrOHEFom7v7IMWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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