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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd520929c09989e241be6a27b3ed2afa26cdd5ecd0e8655910722245d3314a22' 
  AND token = 'Jn3r5t0HmN54+y82g/c6ZzBikHN7l/2xRyVcuWcMdRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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