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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2b3c448863e3c8dc5031404e4bcb4d577ce517cca7265e92e17e799c975518' 
  AND token = 'tDHO3m3l+lLZ/8+VF0n8yGDOF5KMcay+fWWT7xnJiJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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