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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac911261ccbcf4d83953f57ae6ee107ded870ec3be5299dff2306806424b60a1' 
  AND token = 'Dx6iYh2scA35l3s99bK6mCr4MPgBEB3yAv8CemKj4VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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